http://craiglook.com/
awesome site. type aquarium and your zip code and find everything right by you.
description of the site as follows:
Craigslist is undoubtedly the best place online marketplace to barter or trade goods, but its interface and navigation system leaves much to be desired. But since all of its content can be read through RSS feeds, you’re not forced to actually use the Craigslist site. Craiglook is a mash-up of Craiglist feeds (read through Yahoo Pipes) and Google Maps. Its location radius-based search is the site’s most useful feature, and its content is always up to date with the main Craigslist directory.
Enjoy!
BW
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